diff --git a/list-objects.h b/list-objects.h
--- /dev/null
+++ b/list-objects.h
@@ -0,0 +1,8 @@
+#ifndef LIST_OBJECTS_H
+#define LIST_OBJECTS_H
+
+void traverse_commit_list(struct rev_info *revs,
+ void (*show_commit)(struct commit *),
+ void (*show_object)(struct object_array_entry *));
+
+#endif